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memory: unregister AddressSpace MemoryListener within BQL

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address_space_destroy_dispatch is called from an RCU callback and hence
outside the iothread mutex (BQL).  However, after address_space_destroy
no new accesses can hit the destroyed AddressSpace so it is not necessary
to observe changes to the memory map.  Move the memory_listener_unregister
call earlier, to make it thread-safe again.

Reported-by: Alex Williamson <alex.williamson@redhat.com>
Fixes: 374f2981d1
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-02-10 10:25:44 -07:00 • committed by Alex Williamson
parent a2f2d288b5
commit 6e48e8f9e0
3 changed files with 7 additions and 1 deletions
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6
exec.c
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@ -2059,11 +2059,15 @@ void address_space_init_dispatch(AddressSpace *as)
memory_listener_register(&as->dispatch_listener, as);
}
void address_space_unregister(AddressSpace *as)
{
memory_listener_unregister(&as->dispatch_listener);
}
void address_space_destroy_dispatch(AddressSpace *as)
{
AddressSpaceDispatch *d = as->dispatch;
memory_listener_unregister(&as->dispatch_listener);
g_free(d);
as->dispatch = NULL;
}